江苏龙潭组致密砂岩孔隙结构和因子分析

FACTOR ANALYSIS ON THE PORE TESTURE OF THE TIGHT SANDSTONES IN THE LONGTAN FORMATION(JIANGSU)

王文耀 曹家玉 郭光 邱启福

Wang Wenyao Cao Jiayu Guo Guang Qiu Qifu

华东石油地质局地质研究所, 扬州 225002

Geological Research Institute of East China Bureau of Petroleum Geology, MGMR

致密砂岩碎屑类型主要为长石岩屑质石英砂岩,次为长石质岩屑砂岩,且以细粒为主。Φ<5%的样品占63%,K<0.1×10-3μm2的占78%,RM=0.007～0.472μm,瞩细-微喉道致密砂岩。部分孔隙结构参数间相关很好,但它们与常规物性参数间均不相关或不甚相关。借助R型和Q型因子分析选择评定孔隙结构质量的参数,并以RM>0.15μm,C<0.45作为确定(差)储集岩的标准。(差)储集岩以中粒和部分细粒的石英加大粒间孔-长石溶孔砂岩为主,普遍具较高级别的油显示,主要分布于镇江煤矿和宜兴川埠地区,应作为重点勘查对象。

The clastic type of tight sandstones is dominantly made up by feldspathic lithic quart-zose sandstone with fine grain size rather than feldspathic litharenite,As for fine-micro-throat tight sandstones,samples with value of Φ fewer than 5% occupy 63%of the total,those with value of K fewer than 0.1×10-3μm occupy 78%,and the value of RM is 0.007to 0.472μm,A part of porous parameters have good correlations among themselves,butthey have no correlation to the parameters of conventional physical property or even far.With the assistance of R-factorQ-factor analysis,we select the parameters to evaluatethe quality of pore structure,and set the standard with the value of RM more than 0.15μmand the value of C fewer than 0.45 to ascertain(poor)reservoir rocks.The(poor)reser-voir rocks are mainly medium-grained and partly fine-grained quartzose sandstone of in- creased interstice─feldspathic solution opening,and generally have fair-level oil showswhich are common in Zhenjiang Coal Mine and Yixing Chuanbu region,Therefore it is be-lieved these two areas should be good prospecting targets for exploration.

华东石油地质局"八五"地勘课题

https://doi.org/10.11781/sysydz199402164